Add 'third_party/cpp/googleapis/' from commit 'c873fd3aa14fb0d8696588117b5f79693381ba3c' r/581

git-subtree-dir: third_party/cpp/googleapis
git-subtree-mainline: 438050b3d9c0e1dcfe7e26d9446e19fff97ccf88
git-subtree-split: c873fd3aa14fb0d8696588117b5f79693381ba3c

7 files changed, 959 insertions, 0 deletions

diff --git a/third_party/cpp/googleapis/cmake/CompileProtos.cmake b/third_party/cpp/googleapis/cmake/CompileProtos.cmake
new file mode 100644
index 0000000000..788267c8d9
--- /dev/null
+++ b/third_party/cpp/googleapis/cmake/CompileProtos.cmake
@@ -0,0 +1,271 @@
+# ~~~
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ~~~
+
+# Introduce a new TARGET property to associate proto files with a target.
+#
+# We use a function to define the property so it can be called multiple times
+# without introducing the property over and over.
+function (google_cloud_cpp_add_protos_property)
+    set_property(
+        TARGET
+        PROPERTY PROTO_SOURCES BRIEF_DOCS
+                 "The list of .proto files for a target." FULL_DOCS
+                 "List of .proto files specified for a target.")
+endfunction ()
+
+# Generate C++ for .proto files preserving the directory hierarchy
+#
+# Receives a list of `.proto` file names and (a) creates the runs to convert
+# these files to `.pb.h` and `.pb.cc` output files, (b) returns the list of
+# `.pb.cc` files and `.pb.h` files in @p HDRS, and (c) creates the list of files
+# preserving the directory hierarchy, such that if a `.proto` file says:
+#
+# import "foo/bar/baz.proto"
+#
+# the resulting C++ code says:
+#
+# #include <foo/bar/baz.pb.h>
+#
+# Use the `PROTO_PATH` option to provide one or more directories to search for
+# proto files in the import.
+#
+# @par Example
+#
+# google_cloud_cpp_generate_proto( MY_PB_FILES "foo/bar/baz.proto"
+# "foo/bar/qux.proto" PROTO_PATH_DIRECTORIES "another/dir/with/protos")
+#
+# Note that `protoc` the protocol buffer compiler requires your protos to be
+# somewhere in the search path defined by the `--proto_path` (aka -I) options.
+# For example, if you want to generate the `.pb.{h,cc}` files for
+# `foo/bar/baz.proto` then the directory containing `foo` must be in the search
+# path.
+function (google_cloud_cpp_generate_proto SRCS)
+    cmake_parse_arguments(_opt "" "" "PROTO_PATH_DIRECTORIES" ${ARGN})
+    if (NOT _opt_UNPARSED_ARGUMENTS)
+        message(SEND_ERROR "Error: google_cloud_cpp_generate_proto() called"
+                           " without any proto files")
+        return()
+    endif ()
+
+    # Build the list of `--proto_path` options. Use the absolute path for each
+    # option given, and do not include any path more than once.
+    set(protobuf_include_path)
+    foreach (dir ${_opt_PROTO_PATH_DIRECTORIES})
+        get_filename_component(absolute_path ${dir} ABSOLUTE)
+        list(FIND protobuf_include_path "${absolute_path}"
+             already_in_search_path)
+        if (${already_in_search_path} EQUAL -1)
+            list(APPEND protobuf_include_path "--proto_path" "${absolute_path}")
+        endif ()
+    endforeach ()
+
+    set(${SRCS})
+    foreach (filename ${_opt_UNPARSED_ARGUMENTS})
+        get_filename_component(file_directory "${filename}" DIRECTORY)
+        # This gets the filename without the extension, analogous to $(basename
+        # "${filename}" .proto)
+        get_filename_component(file_stem "${filename}" NAME_WE)
+
+        # Strip all the prefixes in ${_opt_PROTO_PATH_DIRECTORIES} from the
+        # source proto directory
+        set(D "${file_directory}")
+        if (DEFINED _opt_PROTO_PATH_DIRECTORIES)
+            foreach (P ${_opt_PROTO_PATH_DIRECTORIES})
+                string(REGEX REPLACE "^${P}" "" T "${D}")
+                set(D ${T})
+            endforeach ()
+        endif ()
+        set(pb_cc "${CMAKE_CURRENT_BINARY_DIR}/${D}/${file_stem}.pb.cc")
+        set(pb_h "${CMAKE_CURRENT_BINARY_DIR}/${D}/${file_stem}.pb.h")
+        list(APPEND ${SRCS} "${pb_cc}" "${pb_h}")
+        add_custom_command(
+            OUTPUT "${pb_cc}" "${pb_h}"
+            COMMAND
+                $<TARGET_FILE:protobuf::protoc> ARGS --cpp_out
+                "${CMAKE_CURRENT_BINARY_DIR}" ${protobuf_include_path}
+                "${filename}"
+            DEPENDS "${filename}" protobuf::protoc
+            COMMENT "Running C++ protocol buffer compiler on ${filename}"
+            VERBATIM)
+    endforeach ()
+
+    set_source_files_properties(${${SRCS}} PROPERTIES GENERATED TRUE)
+    set(${SRCS}
+        ${${SRCS}}
+        PARENT_SCOPE)
+endfunction ()
+
+# Generate gRPC C++ files from .proto files preserving the directory hierarchy.
+#
+# Receives a list of `.proto` file names and (a) creates the runs to convert
+# these files to `.grpc.pb.h` and `.grpc.pb.cc` output files, (b) returns the
+# list of `.grpc.pb.cc` and `.pb.h` files in @p SRCS, and (c) creates the list
+# of files preserving the directory hierarchy, such that if a `.proto` file says
+#
+# import "foo/bar/baz.proto"
+#
+# the resulting C++ code says:
+#
+# #include <foo/bar/baz.pb.h>
+#
+# Use the `PROTO_PATH` option to provide one or more directories to search for
+# proto files in the import.
+#
+# @par Example
+#
+# google_cloud_cpp_generate_grpc( MY_GRPC_PB_FILES "foo/bar/baz.proto"
+# "foo/bar/qux.proto" PROTO_PATH_DIRECTORIES "another/dir/with/protos")
+#
+# Note that `protoc` the protocol buffer compiler requires your protos to be
+# somewhere in the search path defined by the `--proto_path` (aka -I) options.
+# For example, if you want to generate the `.pb.{h,cc}` files for
+# `foo/bar/baz.proto` then the directory containing `foo` must be in the search
+# path.
+function (google_cloud_cpp_generate_grpcpp SRCS)
+    cmake_parse_arguments(_opt "" "" "PROTO_PATH_DIRECTORIES" ${ARGN})
+    if (NOT _opt_UNPARSED_ARGUMENTS)
+        message(
+            SEND_ERROR "Error: google_cloud_cpp_generate_grpc() called without"
+                       " any proto files")
+        return()
+    endif ()
+
+    # Build the list of `--proto_path` options. Use the absolute path for each
+    # option given, and do not include any path more than once.
+    set(protobuf_include_path)
+    foreach (dir ${_opt_PROTO_PATH_DIRECTORIES})
+        get_filename_component(absolute_path ${dir} ABSOLUTE)
+        list(FIND protobuf_include_path "${absolute_path}"
+             already_in_search_path)
+        if (${already_in_search_path} EQUAL -1)
+            list(APPEND protobuf_include_path "--proto_path" "${absolute_path}")
+        endif ()
+    endforeach ()
+
+    set(${SRCS})
+    foreach (filename ${_opt_UNPARSED_ARGUMENTS})
+        get_filename_component(file_directory "${filename}" DIRECTORY)
+        # This gets the filename without the extension, analogous to $(basename
+        # "${filename}" .proto)
+        get_filename_component(file_stem "${filename}" NAME_WE)
+
+        # Strip all the prefixes in ${_opt_PROTO_PATH_DIRECTORIES} from the
+        # source proto directory
+        set(D "${file_directory}")
+        if (DEFINED _opt_PROTO_PATH_DIRECTORIES)
+            foreach (P ${_opt_PROTO_PATH_DIRECTORIES})
+                string(REGEX REPLACE "^${P}" "" T "${D}")
+                set(D ${T})
+            endforeach ()
+        endif ()
+        set(grpc_pb_cc
+            "${CMAKE_CURRENT_BINARY_DIR}/${D}/${file_stem}.grpc.pb.cc")
+        set(grpc_pb_h "${CMAKE_CURRENT_BINARY_DIR}/${D}/${file_stem}.grpc.pb.h")
+        list(APPEND ${SRCS} "${grpc_pb_cc}" "${grpc_pb_h}")
+        add_custom_command(
+            OUTPUT "${grpc_pb_cc}" "${grpc_pb_h}"
+            COMMAND
+                $<TARGET_FILE:protobuf::protoc> ARGS
+                --plugin=protoc-gen-grpc=$<TARGET_FILE:gRPC::grpc_cpp_plugin>
+                "--grpc_out=${CMAKE_CURRENT_BINARY_DIR}"
+                "--cpp_out=${CMAKE_CURRENT_BINARY_DIR}" ${protobuf_include_path}
+                "${filename}"
+            DEPENDS "${filename}" protobuf::protoc gRPC::grpc_cpp_plugin
+            COMMENT "Running gRPC C++ protocol buffer compiler on ${filename}"
+            VERBATIM)
+    endforeach ()
+
+    set_source_files_properties(${${SRCS}} PROPERTIES GENERATED TRUE)
+    set(${SRCS}
+        ${${SRCS}}
+        PARENT_SCOPE)
+endfunction ()
+
+include(GNUInstallDirs)
+
+# Install headers for a C++ proto library.
+function (google_cloud_cpp_install_proto_library_headers target)
+    get_target_property(target_sources ${target} SOURCES)
+    foreach (header ${target_sources})
+        # Skip anything that is not a header file.
+        if (NOT "${header}" MATCHES "\\.h$")
+            continue()
+        endif ()
+        string(REPLACE "${CMAKE_CURRENT_BINARY_DIR}/" "" relative "${header}")
+        get_filename_component(dir "${relative}" DIRECTORY)
+        install(FILES "${header}"
+                DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/${dir}")
+    endforeach ()
+endfunction ()
+
+# Install protos for a C++ proto library.
+function (google_cloud_cpp_install_proto_library_protos target strip_prefix)
+    get_target_property(target_protos ${target} PROTO_SOURCES)
+    foreach (proto ${target_protos})
+        # Skip anything that is not a header file.
+        if (NOT "${proto}" MATCHES "\\.proto$")
+            continue()
+        endif ()
+        string(REPLACE "${strip_prefix}/" "" relative "${proto}")
+        get_filename_component(dir "${relative}" DIRECTORY)
+        # This is modeled after the Protobuf library, it installs the basic
+        # protos (think google/protobuf/any.proto) in the include directory for
+        # C/C++ code. :shrug:
+        install(FILES "${proto}"
+                DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/${dir}")
+    endforeach ()
+endfunction ()
+
+function (google_cloud_cpp_proto_library libname)
+    cmake_parse_arguments(_opt "" "" "PROTO_PATH_DIRECTORIES" ${ARGN})
+    if (NOT _opt_UNPARSED_ARGUMENTS)
+        message(SEND_ERROR "Error: google_cloud_cpp_proto_library() called"
+                           " without any proto files")
+        return()
+    endif ()
+
+    google_cloud_cpp_generate_proto(
+        proto_sources ${_opt_UNPARSED_ARGUMENTS} PROTO_PATH_DIRECTORIES
+        ${_opt_PROTO_PATH_DIRECTORIES})
+
+    add_library(${libname} ${proto_sources})
+    set_property(TARGET ${libname} PROPERTY PROTO_SOURCES
+                                            ${_opt_UNPARSED_ARGUMENTS})
+    target_link_libraries(${libname} PUBLIC gRPC::grpc++ gRPC::grpc
+                                            protobuf::libprotobuf)
+    target_include_directories(
+        ${libname}
+        PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+               $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
+               $<INSTALL_INTERFACE:include>)
+endfunction ()
+
+function (google_cloud_cpp_grpcpp_library libname)
+    cmake_parse_arguments(_opt "" "" "PROTO_PATH_DIRECTORIES" ${ARGN})
+    if (NOT _opt_UNPARSED_ARGUMENTS)
+        message(SEND_ERROR "Error: google_cloud_cpp_proto_library() called"
+                           " without any proto files")
+        return()
+    endif ()
+
+    google_cloud_cpp_generate_grpcpp(
+        grpcpp_sources ${_opt_UNPARSED_ARGUMENTS} PROTO_PATH_DIRECTORIES
+        ${_opt_PROTO_PATH_DIRECTORIES})
+    google_cloud_cpp_proto_library(
+        ${libname} ${_opt_UNPARSED_ARGUMENTS} PROTO_PATH_DIRECTORIES
+        ${_opt_PROTO_PATH_DIRECTORIES})
+    target_sources(${libname} PRIVATE ${grpcpp_sources})
+endfunction ()
diff --git a/third_party/cpp/googleapis/cmake/FindProtobufTargets.cmake b/third_party/cpp/googleapis/cmake/FindProtobufTargets.cmake
new file mode 100644
index 0000000000..ab196118d7
--- /dev/null
+++ b/third_party/cpp/googleapis/cmake/FindProtobufTargets.cmake
@@ -0,0 +1,204 @@
+# ~~~
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ~~~
+
+#[=======================================================================[.rst:
+FindProtobufTargets
+-------------------
+
+A module to use `Protobuf` with less complications.
+
+Using ``find_package(Protobuf)`` should be simple, but it is not.
+
+CMake provides a ``FindProtobuf`` module. Unfortunately it does not generate
+`protobuf::*` targets until CMake-3.9, and `protobuf::protoc` does not
+appear until CMake-3.10.
+
+The CMake-config files generated by `protobuf` always create these targets,
+but on some Linux distributions (e.g. Fedora>=29, and openSUSE-Tumbleweed) there
+are system packages for protobuf, but these packages are installed without the
+CMake-config files. One must either use the ``FindProtobuf`` module, find the
+libraries via `pkg-config`, or find the libraries manually.
+
+When the CMake-config files are installed they produce the same targets as
+recent versions of ``FindProtobuf``. However, they do not produce the
+`Protobuf_LIBRARY`, `Protobuf_INCLUDE_DIR`, etc. that are generated by the
+module. Furthermore, the `protobuf::protoc` library is not usable when loaded
+from the CMake-config files: its ``IMPORTED_LOCATION`` variable is not defined.
+
+This module is designed to provide a single, uniform, ``find_package()``
+module that always produces the same outputs:
+
+- It always generates the ``protobuf::*`` targets.
+- It always defines ``ProtobufTargets_FOUND`` and ``ProtobufTargets_VERSION``.
+- It *prefers* using the CMake config files if they are available.
+- It fallsback on the ``FindProtobuf`` module if the config files are not found.
+- It populates any missing targets and their properties.
+
+The following :prop_tgt:`IMPORTED` targets are defined:
+
+``protobuf::libprotobuf``
+  The protobuf library.
+``protobuf::libprotobuf-lite``
+  The protobuf lite library.
+``protobuf::libprotoc``
+  The protoc library.
+``protobuf::protoc``
+  The protoc compiler.
+
+Example:
+
+.. code-block:: cmake
+
+  find_package(ProtobufTargets REQUIRED)
+  add_executable(bar bar.cc)
+  target_link_libraries(bar PRIVATE protobuf::libprotobuf)
+
+#]=======================================================================]
+
+if (protobuf_DEBUG)
+    message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "protobuf_USE_STATIC_LIBS = ${protobuf_USE_STATIC_LIBS}"
+                   " ProtobufTargets = ${ProtobufTargets_FOUND}")
+endif ()
+
+# Always load thread support, even on Windows.
+find_package(Threads REQUIRED)
+
+# First try to use the ``protobufConfig.cmake`` or ``protobuf-config.cmake``
+# file if it was installed. This is common on systems (or package managers)
+# where protobuf was compiled and installed with `CMake`. Note that on Linux
+# this *must* be all lowercase ``protobuf``, while on Windows it does not
+# matter.
+find_package(protobuf CONFIG)
+
+if (protobuf_DEBUG)
+    message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "protobuf_FOUND = ${protobuf_FOUND}"
+                   " protobuf_VERSION = ${protobuf_VERSION}")
+endif ()
+
+if (protobuf_FOUND)
+    set(ProtobufTargets_FOUND 1)
+    set(ProtobufTargets_VERSION ${protobuf_VERSION})
+    if (protobuf_DEBUG)
+        message(
+            STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "ProtobufTargets_FOUND = ${ProtobufTargets_FOUND}"
+                   " ProtobufTargets_VERSION = ${ProtobufTargets_VERSION}")
+    endif ()
+else ()
+    find_package(Protobuf QUIET)
+    if (Protobuf_FOUND)
+        set(ProtobufTargets_FOUND 1)
+        set(ProtobufTargets_VERSION ${Protobuf_VERSION})
+
+        if (NOT TARGET protobuf::libprotobuf)
+            add_library(protobuf::libprotobuf IMPORTED INTERFACE)
+            set_property(
+                TARGET protobuf::libprotobuf
+                PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${Protobuf_INCLUDE_DIR})
+            set_property(
+                TARGET protobuf::libprotobuf APPEND
+                PROPERTY INTERFACE_LINK_LIBRARIES ${Protobuf_LIBRARY}
+                         Threads::Threads)
+        endif ()
+
+        if (NOT TARGET protobuf::libprotobuf-lite)
+            add_library(protobuf::libprotobuf-lite IMPORTED INTERFACE)
+            set_property(
+                TARGET protobuf::libprotobuf-lite
+                PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${Protobuf_INCLUDE_DIR})
+            set_property(
+                TARGET protobuf::libprotobuf-lite APPEND
+                PROPERTY INTERFACE_LINK_LIBRARIES ${Protobuf_LITE_LIBRARY}
+                         Threads::Threads)
+        endif ()
+
+        if (NOT TARGET protobuf::libprotoc)
+            add_library(protobuf::libprotoc IMPORTED INTERFACE)
+            set_property(
+                TARGET protobuf::libprotoc
+                PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${Protobuf_INCLUDE_DIR})
+            set_property(
+                TARGET protobuf::libprotoc APPEND
+                PROPERTY INTERFACE_LINK_LIBRARIES ${Protobuf_PROTOC_LIBRARY}
+                         Threads::Threads)
+        endif ()
+    endif ()
+endif ()
+
+if (protobuf_DEBUG)
+    message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "ProtobufTargets_FOUND = ${ProtobufTargets_FOUND}"
+                   " ProtobufTargets_VERSION = ${ProtobufTargets_VERSION}")
+endif ()
+
+# We also should try to find the protobuf C++ plugin for the protocol buffers
+# compiler.
+if (ProtobufTargets_FOUND AND NOT TARGET protobuf::protoc)
+    add_executable(protobuf::protoc IMPORTED)
+
+    # Discover the protoc compiler location.
+    find_program(
+        _protobuf_PROTOC_EXECUTABLE
+        NAMES protoc
+        DOC "The Google Protocol Buffers Compiler")
+    if (protobuf_DEBUG)
+        message(
+            STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "ProtobufTargets_FOUND = ${ProtobufTargets_FOUND}"
+                   " ProtobufTargets_VERSION = ${ProtobufTargets_VERSION}"
+                   " EXE = ${_protobuf_PROTOC_EXECUTABLE}")
+    endif ()
+    set_property(TARGET protobuf::protoc
+                 PROPERTY IMPORTED_LOCATION ${_protobuf_PROTOC_EXECUTABLE})
+    set_property(
+        TARGET protobuf::protoc PROPERTY IMPORTED_LOCATION_DEBUG
+                                         ${_protobuf_PROTOC_EXECUTABLE})
+    set_property(
+        TARGET protobuf::protoc PROPERTY IMPORTED_LOCATION_RELEASE
+                                         ${_protobuf_PROTOC_EXECUTABLE})
+    unset(_protobuf_PROTOC_EXECUTABLE)
+
+    if (protobuf_DEBUG)
+        get_target_property(_protobuf_PROTOC_EXECUTABLE protobuf::protoc
+                            IMPORTED_LOCATION)
+        message(
+            STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "LOCATION=${_protobuf_PROTOC_EXECUTABLE}")
+    endif ()
+endif ()
+
+if (protobuf_DEBUG)
+    message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "ProtobufTargets_FOUND = ${ProtobufTargets_FOUND}"
+                   " ProtobufTargets_VERSION = ${ProtobufTargets_VERSION}")
+    if (ProtobufTargets_FOUND)
+        foreach (_target protobuf::libprotobuf protobuf::libprotobuf-lite
+                         protobuf::libprotoc)
+            if (NOT TARGET ${_target})
+                message(
+                    STATUS
+                        "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                        "target=${_target} is NOT a target")
+            endif ()
+        endforeach ()
+        unset(_target)
+    endif ()
+endif ()
+
+find_package_handle_standard_args(ProtobufTargets REQUIRED_VARS
+                                  ProtobufTargets_FOUND ProtobufTargets_VERSION)
diff --git a/third_party/cpp/googleapis/cmake/FindgRPC.cmake b/third_party/cpp/googleapis/cmake/FindgRPC.cmake
new file mode 100644
index 0000000000..358285b620
--- /dev/null
+++ b/third_party/cpp/googleapis/cmake/FindgRPC.cmake
@@ -0,0 +1,333 @@
+# ~~~
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ~~~
+
+#[=======================================================================[.rst:
+FindgRPC
+--------
+
+Locate and configure the gRPC library.
+
+The following variables can be set and are optional:
+
+``gRPC_DEBUG``
+  Show debug messages.
+``gRPC_USE_STATIC_LIBS``
+  Set to ON to force the use of the static libraries.
+  Default is OFF.
+
+Defines the following variables:
+
+``gRPC_FOUND``
+  Found the gRPC library
+``gRPC_VERSION``
+  Version of package found.
+
+The following :prop_tgt:`IMPORTED` targets are also defined:
+
+``gRPC::grpc++``
+  The gRPC C++ library.
+``gRPC::grpc``
+  The gRPC C core library.
+``gRPC::cpp_plugin``
+  The C++ plugin for the Protobuf protoc compiler.
+
+The following cache variables are also available to set or use:
+
+Example:
+
+.. code-block:: cmake
+
+  find_package(gRPC REQUIRED)
+  add_executable(bar bar.cc)
+  target_link_libraries(bar PRIVATE gRPC::grpc++)
+
+#]=======================================================================]
+
+if (gRPC_DEBUG)
+    message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "gRPC_USE_STATIC_LIBS = ${gRPC_USE_STATIC_LIBS}"
+                   " gRPC_FOUND = ${gRPC_FOUND}")
+endif ()
+
+# gRPC always requires Thread support.
+find_package(Threads REQUIRED)
+
+# Load the module to find protobuf with proper targets. Do not use
+# `find_package()` because we (have to) install this module in non-standard
+# locations.
+include(${CMAKE_CURRENT_LIST_DIR}/FindProtobufTargets.cmake)
+
+# The gRPC::grpc_cpp_plugin target is sometimes defined, but without a
+# IMPORTED_LOCATION
+function (_grpc_fix_grpc_cpp_plugin_target)
+    # The target may already exist, do not create it again if it does.
+    if (NOT TARGET gRPC::grpc_cpp_plugin)
+        add_executable(gRPC::grpc_cpp_plugin IMPORTED)
+    endif ()
+    get_target_property(_gRPC_CPP_PLUGIN_EXECUTABLE gRPC::grpc_cpp_plugin
+                        IMPORTED_LOCATION)
+    if (gRPC_DEBUG)
+        message(
+            STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "LOCATION=${_gRPC_CPP_PLUGIN_EXECUTABLE}")
+    endif ()
+    # Even if the target exists, gRPC CMake support files do not define the
+    # executable for the imported target (at least they do not in v1.19.1), so
+    # we need to define it ourselves.
+    if (NOT _gRPC_CPP_PLUGIN_EXECUTABLE)
+        find_program(_gRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin
+                     DOC "The gRPC C++ plugin for protoc")
+        mark_as_advanced(_gRPC_CPP_PLUGIN_EXECUTABLE)
+        if (_gRPC_CPP_PLUGIN_EXECUTABLE)
+            set_property(
+                TARGET gRPC::grpc_cpp_plugin
+                PROPERTY IMPORTED_LOCATION ${_gRPC_CPP_PLUGIN_EXECUTABLE})
+        else ()
+            set(gRPC_FOUND "grpc_cpp_plugin-NOTFOUND")
+        endif ()
+    endif ()
+endfunction ()
+
+# The gRPC::* targets sometimes lack the right definitions to compile cleanly on
+# WIN32
+function (_grpc_fix_grpc_target_definitions)
+    # Including gRPC headers without this definition results in a build error.
+    if (WIN32)
+        set_property(TARGET gRPC::grpc APPEND
+                     PROPERTY INTERFACE_COMPILE_DEFINITIONS _WIN32_WINNT=0x600)
+        set_property(TARGET gRPC::grpc++ APPEND
+                     PROPERTY INTERFACE_COMPILE_DEFINITIONS _WIN32_WINNT=0x600)
+    endif ()
+endfunction ()
+
+# First try to use the `gRPCConfig.cmake` or `grpc-config.cmake` file if it was
+# installed. This is common on systems (or package managers) where gRPC was
+# compiled and installed with `CMake`.
+find_package(gRPC NO_MODULE QUIET)
+
+if (gRPC_DEBUG)
+    message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "NO_MODULE result gRPC_FOUND = ${gRPC_FOUND}")
+endif ()
+
+if (gRPC_FOUND)
+    _grpc_fix_grpc_cpp_plugin_target()
+    _grpc_fix_grpc_target_definitions()
+    return()
+endif ()
+
+include(SelectLibraryConfigurations)
+
+# Internal function: search for normal library as well as a debug one if the
+# debug one is specified also include debug/optimized keywords in *_LIBRARIES
+# variable
+function (_gRPC_find_library name filename)
+    if (${name}_LIBRARY)
+        # Use result recorded by a previous call.
+        return()
+    else ()
+        find_library(${name}_LIBRARY_RELEASE NAMES ${filename})
+        mark_as_advanced(${name}_LIBRARY_RELEASE)
+
+        find_library(${name}_LIBRARY_DEBUG NAMES ${filename}d ${filename})
+        mark_as_advanced(${name}_LIBRARY_DEBUG)
+
+        select_library_configurations(${name})
+
+        if (gRPC_DEBUG)
+            message(
+                STATUS
+                    "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                    "${name} ${filename} RELEASE=${${name}_LIBRARY}"
+                    " DEBUG=${${name}_LIBRARY_DEBUG} DEFAULT=${${name}_LIBRARY}"
+            )
+        endif ()
+
+        set(${name}_LIBRARY
+            "${${name}_LIBRARY}"
+            PARENT_SCOPE)
+    endif ()
+endfunction ()
+
+#
+# Main
+#
+
+# Support preference of static libs by adjusting CMAKE_FIND_LIBRARY_SUFFIXES
+if (_gRPC_USE_STATIC_LIBS)
+    set(_gRPC_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})
+    if (WIN32)
+        set(CMAKE_FIND_LIBRARY_SUFFIXES .lib .a ${CMAKE_FIND_LIBRARY_SUFFIXES})
+    else ()
+        set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
+    endif ()
+endif ()
+
+_grpc_find_library(_gRPC_grpc grpc)
+_grpc_find_library(_gRPC_grpc++ grpc++)
+
+if (NOT _gRPC_INCLUDE_DIR)
+    find_path(_gRPC_INCLUDE_DIR grpcpp/grpcpp.h)
+    mark_as_advanced(_gRPC_INCLUDE_DIR)
+endif ()
+
+if (gRPC_DEBUG)
+    message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   " _gRPC_grpc_LIBRARY = ${_gRPC_grpc_LIBRARY}")
+    message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   " _gRPC_grpc++_LIBRARY = ${_gRPC_grpc++_LIBRARY}")
+    message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   " _gRPC_INCLUDE_DIR = ${_gRPC_INCLUDE_DIR}")
+endif ()
+
+if (_gRPC_grpc_LIBRARY)
+    if (NOT TARGET gRPC::grpc)
+        add_library(gRPC::grpc IMPORTED UNKNOWN)
+        set_target_properties(
+            gRPC::grpc PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
+                                  "${_gRPC_INCLUDE_DIR}")
+        if (EXISTS "${_gRPC_grpc_LIBRARY}")
+            set_target_properties(gRPC::grpc PROPERTIES IMPORTED_LOCATION
+                                                        "${_gRPC_grpc_LIBRARY}")
+        endif ()
+        if (EXISTS "${_gRPC_grpc_LIBRARY_RELEASE}")
+            set_property(TARGET gRPC::grpc APPEND
+                         PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
+            set_target_properties(
+                gRPC::grpc PROPERTIES IMPORTED_LOCATION_RELEASE
+                                      "${_gRPC_grpc_LIBRARY_RELEASE}")
+        endif ()
+        if (EXISTS "${_gRPC_grpc_LIBRARY_DEBUG}")
+            set_property(TARGET gRPC::grpc APPEND
+                         PROPERTY IMPORTED_CONFIGURATIONS DEBUG)
+            set_target_properties(
+                gRPC::grpc PROPERTIES IMPORTED_LOCATION_DEBUG
+                                      "${_gRPC_grpc_LIBRARY_DEBUG}")
+        endif ()
+        set_property(
+            TARGET gRPC::grpc APPEND
+            PROPERTY INTERFACE_LINK_LIBRARIES protobuf::libprotobuf
+                     Threads::Threads)
+    endif ()
+endif ()
+
+if (_gRPC_grpc++_LIBRARY)
+    if (NOT TARGET gRPC::grpc++)
+        add_library(gRPC::grpc++ IMPORTED UNKNOWN)
+        set_target_properties(
+            gRPC::grpc++ PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
+                                    "${_gRPC++_INCLUDE_DIR}")
+        if (EXISTS "${_gRPC_grpc++_LIBRARY}")
+            set_target_properties(
+                gRPC::grpc++ PROPERTIES IMPORTED_LOCATION
+                                        "${_gRPC_grpc++_LIBRARY}")
+        endif ()
+        if (EXISTS "${_gRPC_grpc++_LIBRARY_RELEASE}")
+            set_property(TARGET gRPC::grpc++ APPEND
+                         PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
+            set_target_properties(
+                gRPC::grpc++ PROPERTIES IMPORTED_LOCATION_RELEASE
+                                        "${_gRPC_grpc++_LIBRARY_RELEASE}")
+        endif ()
+        if (EXISTS "${_gRPC_grpc++_LIBRARY_DEBUG}")
+            set_property(TARGET gRPC::grpc++ APPEND
+                         PROPERTY IMPORTED_CONFIGURATIONS DEBUG)
+            set_target_properties(
+                gRPC::grpc++ PROPERTIES IMPORTED_LOCATION_DEBUG
+                                        "${_gRPC_grpc++_LIBRARY_DEBUG}")
+        endif ()
+        set_property(
+            TARGET gRPC::grpc++ APPEND
+            PROPERTY INTERFACE_LINK_LIBRARIES gRPC::grpc protobuf::libprotobuf
+                     Threads::Threads)
+        if (CMAKE_VERSION VERSION_GREATER 3.8)
+            # gRPC++ requires C++11, but only CMake-3.8 introduced a target
+            # compiler feature to meet that requirement.
+            set_property(TARGET gRPC::grpc++ APPEND
+                         PROPERTY INTERFACE_COMPILE_FEATURES cxx_std_11)
+        elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+            # CMake 3.5 is still alive and kicking in some older distros, use
+            # the compiler-specific versions in these cases.
+            set_property(TARGET gRPC::grpc++ APPEND
+                         PROPERTY INTERFACE_COMPILE_OPTIONS "-std=c++11")
+        elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+            set_property(TARGET gRPC::grpc++ APPEND
+                         PROPERTY INTERFACE_COMPILE_OPTIONS "-std=c++11")
+        else ()
+            message(
+                WARNING
+                    "gRPC::grpc++ requires C++11, but this module"
+                    " (${CMAKE_CURRENT_LIST_FILE})"
+                    " cannot enable it for the library target in your CMake and"
+                    " compiler versions. You need to enable C++11 in the"
+                    " CMakeLists.txt for your project. Consider filing a bug"
+                    " so we can fix this problem.")
+        endif ()
+    endif ()
+endif ()
+
+# Restore original find library prefixes
+if (_gRPC_USE_STATIC_LIBS)
+    set(CMAKE_FIND_LIBRARY_PREFIXES "${_gRPC_ORIG_FIND_LIBRARY_PREFIXES}")
+endif ()
+
+file(
+    WRITE "${CMAKE_BINARY_DIR}/get_gRPC_version.cc"
+    [====[
+#include <grpcpp/grpcpp.h>
+#include <iostream>
+int main() {
+  std::cout << grpc::Version(); // no newline to simplify CMake module
+  return 0;
+}
+        ]====])
+
+try_run(
+    _gRPC_GET_VERSION_STATUS
+    _gRPC_GET_VERSION_COMPILE_STATUS
+    "${CMAKE_BINARY_DIR}"
+    "${CMAKE_BINARY_DIR}/get_gRPC_version.cc"
+    LINK_LIBRARIES
+    gRPC::grpc++
+    gRPC::grpc
+    COMPILE_OUTPUT_VARIABLE _gRPC_GET_VERSION_COMPILE_OUTPUT
+    RUN_OUTPUT_VARIABLE gRPC_VERSION)
+
+file(REMOVE "${CMAKE_BINARY_DIR}/get_gRPC_version.cc")
+
+_grpc_fix_grpc_cpp_plugin_target()
+
+if (gRPC_DEBUG)
+    foreach (
+        _var
+        _gRPC_CPP_PLUGIN_EXECUTABLE
+        _gRPC_VERSION_RAW
+        _gRPC_GET_VERSION_STATUS
+        _gRPC_GET_VERSION_COMPILE_STATUS
+        _gRPC_GET_VERSION_COMPILE_OUTPUT
+        _gRPC_grpc_LIBRARY
+        _gRPC_grpc++_LIBRARY
+        _gRPC_INCLUDE_DIR)
+        message(
+            STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+                   "${_var} = ${${_var}}")
+    endforeach ()
+    unset(_var)
+endif ()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(gRPC REQUIRED_VARS _gRPC_grpc_LIBRARY
+                                  _gRPC_INCLUDE_DIR VERSION_VAR gRPC_VERSION)
diff --git a/third_party/cpp/googleapis/cmake/SelectMSVCRuntime.cmake b/third_party/cpp/googleapis/cmake/SelectMSVCRuntime.cmake
new file mode 100644
index 0000000000..feb2fe46c3
--- /dev/null
+++ b/third_party/cpp/googleapis/cmake/SelectMSVCRuntime.cmake
@@ -0,0 +1,39 @@
+# ~~~
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ~~~
+
+# When compiling against *-static vcpkg packages we need to use the static C++
+# runtime with MSVC. The default is to use the dynamic runtime, which does not
+# work in this case.  This seems to be the recommended way to change the
+# runtime:
+#
+# ~~~
+#  https://gitlab.kitware.com/cmake/community/wikis/FAQ#how-can-i-build-my-msvc-application-with-a-static-runtime
+# ~~~
+#
+# Note that currently we use VCPKG_TARGET_TRIPLET to determine if the static
+# runtime is needed. In the future we may need to use a more complex expression
+# to determine this, but this is a good start.
+#
+if (MSVC AND VCPKG_TARGET_TRIPLET MATCHES "-static$")
+    foreach (flag_var
+             CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
+             CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
+        if (${flag_var} MATCHES "/MD")
+            string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
+        endif ()
+    endforeach (flag_var)
+    unset(flag_var)
+endif ()
diff --git a/third_party/cpp/googleapis/cmake/config-version.cmake.in b/third_party/cpp/googleapis/cmake/config-version.cmake.in
new file mode 100644
index 0000000000..29891a6bde
--- /dev/null
+++ b/third_party/cpp/googleapis/cmake/config-version.cmake.in
@@ -0,0 +1,35 @@
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set(PACKAGE_VERSION @DOXYGEN_PROJECT_NUMBER@)
+
+# This package has not reached 1.0, there are no compatibility guarantees
+# before then.
+if (@GOOGLE_CLOUD_CPP_CONFIG_VERSION_MAJOR@ EQUAL 0)
+    if ("${PACKAGE_FIND_VERSION}" STREQUAL "")
+        set(PACKAGE_VERSION_COMPATIBLE TRUE)
+    elseif ("${PACKAGE_VERSION}" VERSION_EQUAL "${PACKAGE_FIND_VERSION}")
+        set(PACKAGE_VERSION_COMPATIBLE TRUE)
+        set(PACKAGE_VERSION_EXACT TRUE)
+    else ()
+        set(PACKAGE_VERSION_UNSUITABLE TRUE)
+    endif ()
+elseif("${PACKAGE_VERSION}" VERSION_LESS "${PACKAGE_FIND_VERSION}")
+    set(PACKAGE_VERSION_COMPATIBLE FALSE)
+else()
+    set(PACKAGE_VERSION_COMPATIBLE TRUE)
+    if ("${PACKAGE_VERSION}" VERSION_EQUAL "${PACKAGE_FIND_VERSION}")
+        set(PACKAGE_VERSION_EXACT TRUE)
+    endif()
+endif()
diff --git a/third_party/cpp/googleapis/cmake/config.cmake.in b/third_party/cpp/googleapis/cmake/config.cmake.in
new file mode 100644
index 0000000000..02169ef85c
--- /dev/null
+++ b/third_party/cpp/googleapis/cmake/config.cmake.in
@@ -0,0 +1,51 @@
+# ~~~
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ~~~
+
+include("${CMAKE_CURRENT_LIST_DIR}/FindProtobufTargets.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/FindgRPC.cmake")
+
+include("${CMAKE_CURRENT_LIST_DIR}/googleapis-targets.cmake")
+
+foreach (_target
+         api_annotations
+         api_auth
+         api_client
+         api_field_behavior
+         api_http
+         api_resource
+         bigtable
+         cloud_bigquery
+         devtools_cloudtrace_v2_trace
+         devtools_cloudtrace_v2_tracing
+         iam_v1_iam_policy
+         iam_v1_options
+         iam_v1_policy
+         longrunning_operations
+         pubsub
+         rpc_error_details
+         rpc_status
+         spanner
+         storage
+         type_expr)
+    set(scoped_name "googleapis-c++::${_target}_protos")
+    set(imported_name "googleapis_cpp_${_target}_protos")
+    if (NOT TARGET ${scoped_name})
+        add_library(${scoped_name} IMPORTED INTERFACE)
+        set_target_properties(${scoped_name}
+                              PROPERTIES INTERFACE_LINK_LIBRARIES
+                              ${imported_name})
+    endif ()
+endforeach ()
diff --git a/third_party/cpp/googleapis/cmake/config.pc.in b/third_party/cpp/googleapis/cmake/config.pc.in
new file mode 100644
index 0000000000..af068beb74
--- /dev/null
+++ b/third_party/cpp/googleapis/cmake/config.pc.in
@@ -0,0 +1,26 @@
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}/@CMAKE_INSTALL_BINDIR@
+libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+
+Name: @GOOGLE_CLOUD_CPP_PC_NAME@
+Description: @GOOGLE_CLOUD_CPP_PC_DESCRIPTION@
+Requires: @GOOGLE_CLOUD_CPP_PC_REQUIRES@
+Version: @DOXYGEN_PROJECT_NUMBER@
+
+Libs: -L${libdir} @GOOGLE_CLOUD_CPP_PC_LIBS@
+Cflags: -I${includedir}